better vertex stringification
formatting
splitting iter's rather repeat takes
naming
naming
also naming
more naming
new cylinder generator

todo: allow for more than single between ring connectivity
new generator: line

todo: wider connectivity range?
new generator: rectangular lattice

may want to move square lattice into same file, since it (obviously)
reuses the rect methods
new generator: tree
stub testing files for new generators
incomplete facedcube generator